A very intense weather system developed over the central U.S. during the day on the 12th.  A strong upper level system moved through the area with mid and upper level winds in the 70 to 90 kt range.  Low level winds of 35 to 50 kts transported moisture north into the system.  High temperatures reached the mid 60s to low 70s, with dew point readings approaching 60 by late afternoon.  A surface low developed over northern Kansas during the previous night and lifted northeast into eastern South Dakota during the afternoon of the 12th, then into central Minnesota as a 985 mb low by late evening.  The atmosphere became quite unstable with CAPE values reaching 1000 J/kg by late afternoon.  The Lifted Index values were in the -5 C. range.  Being as it was in November, the freezing level was quite low during the event, in the 10,000 to 11,000 foot range.  Though the soundings were quite unidirectional, there was plenty of shear with zero to 6 km shear values around 65 kts. Thunderstorms erupted during the afternoon in west central in to southwest Iowa.  The storms became severe quite quickly.  Initially the storms produce quarter to golf ball size hail, with 2 1/2 inch diameter hail falling in Dallas County.  Hail up to baseball size fell in Greene County as well.  The system transitioned into a tornadic system within an hour with several tornadoes touching down in the central sections of the state.  At least 9 communities were hit by tornadoes and 65 homes damaged or destroyed.  An 82 year old woman was killed in Stratford when the tornado demolished her home.  In a 2 or 3 block area of downtown Woodward, at least 12 houses were totally destroyed.  There was one minor injury in Ames,  two serious injuries in the Woodward area, and three injuries in Stratford.  Due to the extensive damage to property caused by the tornadoes, Iowa Governor Vilsack declared Boone, Story, Webster, Dallas and Hamilton Counties disaster areas.A long-lived tornado tracked through several counties across central Iowa during the late afternoon hours of Nov. 12, 2005.  The tornado path is estimated at 27.5 miles long and between 100 and 150 yards wide along the damage path.Tornado (1) initially touched down just west of E Avenue (just south of Boxholm in northwest Boone county), one half mile south of Boone County Highway E18 at approximately 4:27 p.m as an F1 tornado.  The tornado then tracked northeast across E Avenue, hitting a farm just north of E18, damaging the home and some out buildings.  It also flipped over one pickup truck and killed two horses at this location.The tornado continued northeast, spreading debris across F Avenue just north of 125th Street as it maintained F1 intensity.  Two additional homes were damaged with outbuildings destroyed as the tornado tracked northeast across G and H Avenues near 105th Avenue.  It then intensified to an F2 tornado as it crossed the Boone/Webster county line.  Another home was heavily damaged and a large outbuilding destroyed just north of the Boone/Webster county line.  The tornado quickly moved northeast, crossing 390th Street and headed toward the Des Moines River, weakening to an F1 tornado.A continuous, but weak damage path was observed crossing the river as the tornado tracked across open farmland and land adjacent the Des Moines River.  The tornado has been rated an F1 tornado during this time.  After crossing County D64 in Webster county, the tornado struck another farm near 370th Street and Washington Avenue, damaging the residence and destroying a machine shed along with most of its contents.  The tornado again intensified to an F2 at this location.The tornado then headed toward Stratford, crossing the Webster and Hamilton county line just west of County Road D54.  The tornado entered Stratford at 4:46 p.m. on the west-central end of town, heavily damaging many homes.  The tornado crossed the city park and then exited the city near the north-central portion of Stratford.  Numerous homes were heavily damaged with one fatality.As the tornado left Stratford, it continued on a northeast track, lifting and dropping to the ground several times as an F0 and F1 tornado.  It damaged three additional farms northeast of Stratford with the last damaged farm north of 320th Street and west of County Road R21 in Hamilton County.Tornado (2) touched down one mile west of Minburn in Dallas County  according to the aerial survey.  The tornado tracked northeast for about eight miles, producing F0-F1 damage before intensifying near Highway 141.  The tornado produced F2 damage at a farm one mile southwest of Woodward, and continued to produce F2 damage through the south and east portions of Woodward.  The tornado dissipated one mile northeast of Woodward.  Severe houses slid off their foundations in Woodward, and a double-wide home was flipped upside down into the street.  Total path length was 11 miles.Tornado (3) touched down in open fields one mile northwest of Madrid.  It hit a home three miles north of Madrid on Highway 17, producing F1 damage.  One other farm site sustained damage as the tornado moved northeast.  The tornado dissipated after a six mile track.Tornado (4) started just west of Ames near the Highway 30 and Lincoln Way Split, according to the aerial survey.  The tornado produced F1-F2 damage on the northwest fringe of Ames.  It weakened as it moved northeast, before intensifying again and produced F2 damage to a farm site just south of Gilbert.  F1 damage occurred as the tornado crossed highway 69.  The tornado dissipated three miles south of Story City after a 10 mile track.Tornado (5) was a short-lived satellite tornado that was on the ground for 1.6 miles ending at the southwest edge of Story City.  The aerial survey showed very minor damage.Tornado (6) developed one mile west of Roland and tracked across the extreme southeast corner of Hamilton county before entering Hardin county.  The tornado produced damage up to F1 intensity to rural farm sites in far northern Story county and five miles south of Radcliffe in Hardin county.  The KCCI-TV aerial survey indicated the track was nine miles in length.Tornado (7) was a brief touchdown just south of Williams in Hamilton County.  No damage was found from this brief tornado and it is not shown here.Tornado (8) was briefly sighted near Blakesburg in Monroe County.  The tornado produced minor damage to a farm building but was not surveyed.Tornado (9) touched down briefly north of Steamboat Rock in Hardin County.  The tornado caused little damage.Tornado (10) was actually the first tornado of the day.  It formed from the same supercell that eventually moved northeast into the Stratford area.  The tornado caused little damage as it moved through fields south of the Scranton Area.Tornado (11) was a brief touchdown on the southwest edge of the Ames City limits.  This tornado was from the same parent cell as the previous tornado that touched down in Ames, but was distinct.  The tornado was weak and lifted lawn chairs and caused some shingle damage.  This tornado was ANTICYCLONIC in nature.

Hail in DALLAS, IOWA
From 12-NOV-05 16:26:00 to 12-NOV-05 16:26:00 (CST)
Location: WOODWARD
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in DALLAS, IOWA
From 12-NOV-05 16:27:00 to 12-NOV-05 16:27:00 (CST)
Location: MINBURN
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in HAMILTON, IOWA
From 12-NOV-05 16:50:00 to 12-NOV-05 16:50:00 (CST)
Location: WEBSTER CITY
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Tornado in BOONE, IOWA
From 12-NOV-05 16:27:00 to 12-NOV-05 16:33:00 (CST)
Location: BOXHOLM
Tornado F-scale: F1
Property damage: 250K
Reported by: LAW ENFORCEMENT

Tornado moved across Boone County and moved into Webster County.

Hail in STORY, IOWA
From 12-NOV-05 16:50:00 to 12-NOV-05 16:50:00 (CST)
Location: AMES
Magnitude: 0.88 
Property damage: 1K
Reported by: TRAINED SPOTTER

Hail in GREENE, IOWA
From 12-NOV-05 15:53:00 to 12-NOV-05 15:53:00 (CST)
Location: GRAND JCT
Magnitude: 2.75 
Property damage: 15K
Reported by: AMATEUR RADIO

Hail in GREENE, IOWA
From 12-NOV-05 15:56:00 to 12-NOV-05 15:56:00 (CST)
Location: DANA
Magnitude: 2.50 
Property damage: 15K
Reported by: AMATEUR RADIO

Hail in GREENE, IOWA
From 12-NOV-05 15:42:00 to 12-NOV-05 15:42:00 (CST)
Location: SCRANTON
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in GUTHRIE, IOWA
From 12-NOV-05 15:47:00 to 12-NOV-05 15:47:00 (CST)
Location: STUART
Magnitude: 1.75 
Property damage: 10K
Reported by: TRAINED SPOTTER

Hail in DALLAS, IOWA
From 12-NOV-05 16:06:00 to 12-NOV-05 16:09:00 (CST)
Location: LINDEN
Magnitude: 1.75 
Property damage: 10K
Reported by: LAW ENFORCEMENT

Hail in DALLAS, IOWA
From 12-NOV-05 16:14:00 to 12-NOV-05 16:14:00 (CST)
Location: LINDEN
Magnitude: 2.50 
Property damage: 15K
Reported by: STORM CHASER

Tornado in BOONE, IOWA
From 12-NOV-05 16:48:00 to 12-NOV-05 16:54:00 (CST)
Location: MADRID
Tornado F-scale: F1
Property damage: 200K
Reported by: LAW ENFORCEMENT

Tornado hit one home, but remained mostly in open countryside.

Tornado in BOONE, IOWA
From 12-NOV-05 16:58:00 to 12-NOV-05 17:01:00 (CST)
Location: BOONE
Tornado F-scale: F0
Property damage: 100K
Reported by: LAW ENFORCEMENT

Tornado touched down in Boone County and moved into Story County.

Tornado in STORY, IOWA
From 12-NOV-05 17:01:00 to 12-NOV-05 17:12:00 (CST)
Location: AMES
Tornado F-scale: F2
Property damage: 250K
Reported by: LAW ENFORCEMENT

Tornado moved from Boone County into Story County.  One minor injury occurred on the west side of Ames.

Tornado in STORY, IOWA
From 12-NOV-05 17:15:00 to 12-NOV-05 17:18:00 (CST)
Location: STORY CITY
Tornado F-scale: F0
Property damage: 50K
Reported by: LAW ENFORCEMENT

Tornado was on the ground briefly southwest of Story City.

Tornado in STORY, IOWA
From 12-NOV-05 17:20:00 to 12-NOV-05 17:23:00 (CST)
Location: ROLAND
Tornado F-scale: F1
Property damage: 580K
Reported by: LAW ENFORCEMENT

Tornado developed in Story County and moved into Hamilton County.

Tornado in HAMILTON, IOWA
From 12-NOV-05 17:23:00 to 12-NOV-05 17:24:00 (CST)
Location: ELLSWORTH
Tornado F-scale: F1
Property damage: 75K
Reported by: LAW ENFORCEMENT

Tornado moved from Story County and across southeast Hamilton County, then into Hardin County.

Tornado in HARDIN, IOWA
From 12-NOV-05 17:24:00 to 12-NOV-05 17:27:00 (CST)
Location: GARDEN CITY
Tornado F-scale: F1
Property damage: 75K
Reported by: LAW ENFORCEMENT

Tornado moved into the county from Hamilton County.

Tornado in HAMILTON, IOWA
From 12-NOV-05 17:27:00 to 12-NOV-05 17:30:00 (CST)
Location: WILLIAMS
Tornado F-scale: F0
Property damage: 10K
Reported by: LAW ENFORCEMENT

Brief touchdown south of the town of Williams.

Tornado in MONROE, IOWA
From 12-NOV-05 18:40:00 to 12-NOV-05 18:43:00 (CST)
Location: ALBIA
Tornado F-scale: F1
Property damage: 50K
Reported by: LAW ENFORCEMENT

Tornado touched down southeast of Albia and tracked across mostly open country.

Tornado in HARDIN, IOWA
From 12-NOV-05 17:50:00 to 12-NOV-05 17:50:00 (CST)
Location: STEAMBOAT ROCK
Tornado F-scale: F0
Property damage: 10K
Reported by: TRAINED SPOTTER

Brief tornado touchdown north of Steamboat Rock.

Tornado in STORY, IOWA
From 12-NOV-05 16:56:00 to 12-NOV-05 16:58:00 (CST)
Location: AMES
Tornado F-scale: F0
Property damage: 2K
Reported by: NWS STORM SURVEY

Tornado touched down briefly on the southwest edge of Ames.  The tornado showed anticyclonic rotation.

Tornado in GREENE, IOWA
From 12-NOV-05 15:50:00 to 12-NOV-05 15:50:00 (CST)
Location: SCRANTON
Tornado F-scale: F1
Property damage: 5K
Reported by: STORM CHASER

Tornado touched down in open areas south of Scranton, then lifted.

Tornado in WEBSTER, IOWA
From 12-NOV-05 16:33:00 to 12-NOV-05 16:41:00 (CST)
Location: DAYTON
Tornado F-scale: F2
Property damage: 450K
Reported by: LAW ENFORCEMENT

Tornado moved in from Boone County, then tracked into Hamilton County.

Tornado in HAMILTON, IOWA
From 12-NOV-05 16:41:00 to 12-NOV-05 16:48:00 (CST)
Location: STRATFORD
Tornado F-scale: F3
Property damage: 11.7M
Reported by: LAW ENFORCEMENT

Tornado moved from Webster County in to Hamilton County.  One woman was killed when her house collapsed.

Tornado in DALLAS, IOWA
From 12-NOV-05 16:28:00 to 12-NOV-05 16:41:00 (CST)
Location: MINBURN
Tornado F-scale: F2
Property damage: 2.5M
Reported by: LAW ENFORCEMENT

Tornado touched down in Dallas County and moved into Boone County.

Tornado in BOONE, IOWA
From 12-NOV-05 16:41:00 to 12-NOV-05 16:41:00 (CST)
Location: MADRID
Tornado F-scale: F2
Property damage: 750K
Reported by: LAW ENFORCEMENT

Tornado moved from Dallas County into Boone County.  Two injuries occurred in Woodward.